High Quality Stainless Steel Control Valves Fisher
169500.00฿
High Quality Stainless Steel Control Valves Fisher Actuators Fisher Foxboro Spirax Sarco Neles Flowserve Smart Valve Positioners
Specification
item | value |
place of origin | Chinese |
Valve type | Ball valve |
warranty | 1 Year |
customized support | OEM |
Hysteresis | ≤0.3 % |
Sensitivity | ≤0.1 % |
Direction of action | Reversible |
Temperature | ≤0.15 %/10 K |
Degree of protection | IP 66/NEMA 4X |
Deviation | ≤1 % |
Minimum current | 3.6 mA for display 3.8 mA for operation |
Signal range | 4 to 20 mA |
Static destruction limit | 100 mA |
Feature | Spirax Sarco control valve Spirax Sarco positioner |
1️⃣ Fisher Pneumatic Actuators (Linear & Rotary)
Model | Type | Motion Type | Signal Type | Key Features | Typical Application |
|---|---|---|---|---|---|
Fisher 656 | Spring-diaphragm actuator | Linear | 3–15 psi pneumatic | Compact, reliable, spring return | Small globe valves, light process control |
Fisher 657 | Spring-diaphragm actuator | Linear | 3–15 psi pneumatic | Higher thrust than 656, fail-safe design | Steam control, chemical dosing |
Fisher 667 | Heavy-duty diaphragm actuator | Linear | 3–15 psi pneumatic | High thrust, long stroke, large valve compatibility | Power plants, high-pressure steam |
Fisher 1051 | Rotary vane actuator | Rotary (0–90°) | Pneumatic | Compact, mid-torque range | Butterfly & ball valves (medium size) |
Fisher 1052 | Rack-and-pinion rotary actuator | Rotary (0–90°) | Pneumatic | High torque output, heavy-duty | Large ball/butterfly valves |
2️⃣ Spirax Sarco Valve Positioners
Model | Type | Input Signal | Communication | Key Features | Industry Focus |
|---|---|---|---|---|---|
EP5 | Electro-pneumatic positioner | 4–20 mA | None | Analog control, compact, reliable | Steam systems |
EP6 | Electro-pneumatic positioner | 4–20 mA | None | Higher precision, improved stability | Thermal & energy plants |
EP500 | Smart digital positioner | 4–20 mA | HART | Auto-calibration, diagnostics | Critical steam control |
SP400 | Analog positioner | 4–20 mA | None | Basic PID control | General industry |
SP500 | Smart digital positioner | 4–20 mA | HART | Advanced diagnostics, valve monitoring | High-accuracy steam control |
3️⃣ Flowserve Logix Series Positioners
Model | Type | Input | Communication | Key Features | Application |
|---|---|---|---|---|---|
Logix 520MD | Electro-pneumatic | 4–20 mA | None | Basic analog control | Standard industrial loops |
Logix 3200MD | Digital smart positioner | 4–20 mA | HART | Auto setup, diagnostics | Process industries |
Logix 3800MD | Advanced digital positioner | 4–20 mA | HART / Fieldbus / Profibus | Adaptive tuning, valve health monitoring | Oil & gas, severe service |
4️⃣ Foxboro (Schneider Electric) Positioners
Model | Type | Input | Communication | Key Features | Typical Use |
|---|---|---|---|---|---|
SRD960 | Analog electro-pneumatic | 4–20 mA | None | Simple, cost-effective | Basic control loops |
SRD991 | Smart digital positioner | 4–20 mA | HART | Auto calibration, high accuracy | Chemical & oil industries |
SRD998 | Advanced smart positioner | 4–20 mA | HART | Explosion-proof, severe environment rated | Oil & gas hazardous areas |
5️⃣ Neles (Valmet / Metso) Smart Positioners
Model | Type | Input | Communication | Key Features | Application |
|---|---|---|---|---|---|
ND7000 | Smart digital positioner | 4–20 mA | HART / Fieldbus | Auto tuning, diagnostics | General process control |
ND9000 | Advanced smart positioner | 4–20 mA | HART / Fieldbus | High vibration resistance, partial stroke testing | Oil & gas |
ND9103HX8T | Hazardous area smart positioner | 4–20 mA | HART | ATEX / IECEx certified, explosion-proof | Refinery & offshore |
Engineering Classification Summary
Category | Models |
|---|---|
Pneumatic Actuators Only | Fisher 656, 657, 667, 1051, 1052 |
Analog Positioners | EP5, EP6, SP400, Logix 520MD, SRD960 |
Smart Digital Positioners | EP500, SP500, Logix 3200MD, Logix 3800MD, SRD991, SRD998, ND7000, ND9000, ND9103HX8T |
Technical Integration Notes (PLC / DCS)
• All positioners use 4–20 mA analog control
• Smart versions support HART (diagnostics over analog line)
• Some models support Foundation Fieldbus or Profibus
• Actuators require instrument air supply (typically 4–6 bar)
• Fail-safe action: spring return (FO / FC configuration)
How to Choose Based on Process Criteria
🔹 1) Control Precision Needed
Precision Level | Recommended Positioners |
|---|---|
Basic adaptability | Analog (4–20 mA) SP400 / SRD960 / Logix 520MD |
Moderate accuracy | SRD991 / EP6 / Logix 3200MD |
High precision & tuning | EP500 / SP500 / ND7000 |
Severe control & diagnostics | ND9000 / SRD998 / Logix 3800MD |
🔹 2) Communication Requirement
Communication Requirement | Suitable Models |
|---|---|
Only 4–20 mA control | SP400 / SRD960 / Logix 520MD |
HART device diagnostics | EP500 / SP500 / SRD991 / ND7000 / Logix 3200MD |
Fieldbus integration | ND7000 (optional), Logix 3800MD |
Profibus / Foundation Fieldbus | Logix 3800MD |
🔹 3) Valve Motion / Valve Type
Valve Motion | Best Actuator |
|---|---|
Linear (Globe Valve) | Fisher 656 / 657 / 667 |
Rotary (Ball / Butterfly) | Fisher 1051 (medium torque) |
High torque rotary | Fisher 1052 |
🧠 Positioner Technology Differences
Technology | Function | Advantage |
|---|---|---|
Analog Electro-pneumatic | Converts 4–20 mA to pneumatic output | Low-cost, simple control |
HART Smart Positioner | Adds digital diagnostics via HART | Remote tuning & health data |
Fieldbus/Profibus Smart | Full digital network control | Best for distributed control systems |
🛠 Typical Engineering Requirements & Choices
📌 If you need remote diagnostics + trending
➡ HART Smart Positioner like ND7000 / EP500 / SRD991
📌 For PLC or DCS integration
➡ Use HART devices and connect through a HART multiplexer or gateway
📌 If process is harsh or hazardous
➡ Certified smart positioners (ND9103HX8T, SRD998) with rugged actuators
📌 If you want lowest cost per valve
➡ Analog positioners + basic pneumatic actuators
🤖 Recommended Combinations
Typical Use Case | Actuator + Positioner |
|---|---|
General industrial | Fisher 657 + SRD960 / SP400 |
High-accuracy control | Fisher 657 + Logix 3200MD |
Steam energy control | Fisher 667 + Spirax EP500 |
Refinery / Severe service | Fisher 667 + ND9000 / SRD998 |
Fast process dynamics | Fisher 1052 + Logix 3800MD |